Door lock



yJuly 2,-1957 Filed Aug. l7, 1955 W. V. SCHWEITZER DOOR LOCK 2 Sheets-Sheet l INVENTOR. W/Ll//m V. Sc//w/TZER El, n4@

United States DOOR LOCK Application August 17, 1955, Serial No. 529,017

3 Claims. (Cl. 292-169) This invention relates to a door lock and more particularly to a door lock of the so-called unit type which is primarily intended for use on bedroom and bathroom doors.

The lock embodying the instant invention consititutes an improvement over the bedroom and bathroom unit lock disclosed in United States Patent No. 2,666,320 of Ernest L. Teich, granted January 19, 1954. In the prior structure disclosed in said patent, the outer rollback is shifted axially of the outer knob shank, by depression of the pushbutton extending from the inner knob, into locking notches in the knob shank bearing sleeve which prevent rotation of the rollback and the outer knob shank and thereby dog the outer knob against operation. The outer rollback is held in dogging position by springpressed detent pins on the retractor yoke which are depressed by the outer rollback upon movement toward dogging position and are then projected therebehind to hold said rollback in dogging position until the retractor is retracted either by rotation of the inner knob or upon depression of the latch bolt as when the door is closed. Upon this occurrence, a spring in the outer knob shank returns the outer rollback to normal undogging position wherein rotation of the outer knob is permitted.

It was found, however, that if the outer rollback is inadvertently moved into dogging position by accidental depression of the pushbutton while the door is open, and the person closing the door turns the outer knob, the outer rollback is then pinched between the outer knob shank and the sides of the locking notches in the bearing sleeve and is thereby prevented from returning to undogging position upon depression of the retractor as the latch bolt engages the strike when the door is closed. When the retractor returns to its normal position upon entry of the latch bolt into the opening in the strike, the detent pins thereon resume their position behind the outer rollback and retain it in dogging position when the outer knob is released by the person closing the door, thereby preventing operation of the outer knob and re-entry into thev room.

The primary object of the instant invention is to provide a unit lock for bedroom and bathroom doors which cannot be accidentally locked in the manner above described when the door is closed from the outer side thereof.

This and other object of the invention are attained by providing in the unit lock a third or intermediate rollback which is similar to the inner and the outer rollbacks and is disposed therebetween and in the slots in the outer knob shank. The intermediate rollback is acted upon by the detent pins on the retractor and is adapted to hold the outer rollback in dogging position, but is at no time disposed in the locking notches in the bearing sleeve of the lock so that it is always capable of returning to undogging position upon depression of the retractor.

Further objects and advantages of this invention will be more clearly understood from the following description and the accompanying drawings in which:

Fig. 1 is a plan view of the unit lock embodying the arent yaice instant invention illustrated in normal unlocked condition.

Fig. 2 is a fragmentary plan view of the knob shank bearing sleeve further illustrating the normal position of the rollbacks.

Fig. 3 is a sectional front view of said lock, taken on line 3 3 of Fig. l, and again showing the lock mechanism in normal unlocked condition.

Fig. 4 is a sectional end view of the lock, taken on line 4-4 of Fig. 3, illustrating the intermediate rollback.

Fig. 5 is a sectional end view of the knob bearing sleeve illustrating the inner rollback.

Fig. 6 is a similar view illustrating the outer rollback.

Fig. 7 is an enlarged fragmentary plan view, partially in section, illustrating the relative positions of the rollbacks when in dogging position.

Fig. 8 is an enlarged fragmentary front view, partially in central vertical section, further illustrating the rollbacks when in dogging position.

Fig. 9 is an enlarged sectional end view through the knob shank bearing sleeve, taken on line 99 of Fig. 8, and illustrating the outer rollback in clogging position and the position which it assumes when the outer knob is turned as the door is closed.

Fig. 10 is a view similar to Fig. 8 illustrating the relative positions of the rollbacks after the door has been closed, but before the outer rollback has been released.

The unit lock embodying the instant invention is similar in most respects to the unit latch or lock originally disclosed in my co-pending application Serial No. 498,525 tiled April l, 1955, as it utilizes the same frame structure, escutcheon plates and retractor mechanism previously disclosed. The basic device has, however, been modified by inclusion of the elements embodying the instant invention for use on bedroom and bathroom doors.

Referring to the drawings, it will be seen that the frame of the unit lock includes an elongated housing 5 having a tubular knob shank bearing sleeve 6 extending transversely through the sidewalls thereof; said bearing sleeve being secured to said housing in the manner fully disclosed in said co-pending application and being provided with diametrically opposed transverse clearance openings 7-7 in the wall thereof disposed symetrically with respect to the longitudinal center plane of the housing. From the opposite side edges of said transverse openings there extend diametrically opposed locking notches 8 8 and 9-9. A supporting plate 10 is secured to said housing and extends transversely thereacross, and a latch bolt 11 is pivotally mounted to said housing and extends through an opening in the front wall thereof; said latch bolt being actuated by a conventional retractor 12 including a yoke portion 12-a which straddles the bearing sleeve 6 and has laterally extending arms 12-b- 12-b providing rollback platforms. A bar 12-c extends forwardly from said yoke portion through an opening in the supporting plate 10 and is pinned to the latch bolt l1 in the conventional manner. A compression spring 13 surrounds said bar and urges the retractor and the latch bolt into normal projected position as illustrated in Figs. l and 4. The retractor 12 carries detent pins 14-14 which project through holes in the arms 12-b- 12-[1 and have tapered end portions which extend slightly beyond the front faces of said arms. Said detent pins are urged into normal projected position, as illustrated in Fig. 42 by leaf springs 15-15 which are secured to the rear faces of said arms.

The knob shank bearing sleeve 6 rotatably supports inner and outer tubular knob Shanks 16 and 17, respectively, which have secured thereto inner and outer knobs 18 and 19; said knobs being secured to said knob Shanks in the manner fully disclosed in United States Patent No. 2,675,692 of Nicholas A. Welch et al., issued April 20,

1954. The inner and the outer knob shanks are retained in the tubular bearing'sleeve by suitable retaining rings -20, as illustrated in my above mentioned co-pending application, and the adjacent ends of said inner and outer knob 'Shanks contain diametrically opposed VSlots 21-21 and 22 22, respectively. It will be .noted'that the slots in the outer knob shank are considerably deeper than the slots in the inner knob shank and extend to substantially theends of the outer Vlocking notches .9 9 in the bearing sleeve 6.

The inner knob shank carries aninner rollback 23 of conventional form which includes a'circular intermediate portion 24, that is disposed withinthe bore of the inner knob shank, Vand radially yextending Yarms 25- 25 which extend through the slots 21 21KY in said knob shank, through the transverse openings 7 7 in said bearing sleeve andintoengagement Withthe arms 12-b-12-b of the retractor. The slots 2]. 21 in the inner knob shank are of a depth substantially equal to the thickness of the inner rollback 23, and said rollback is retained in said slots by atspacing washer 26 'that is contained within the bearing sleeve and is disposed between the adjacent ends of the inner andthe outer knob Shanks.

The outer knob shank 17 carries two rollbacks similar in-shape to the inner rollbackthat is, an intermediate rollback '27 and an outer rollback 28. The intermediate rollback has a circular central portion 29.contained within the bore-of the outer knob shank and radially extending arms30 30 which are co-extensive with the arms of the inner rollback and extend through the slots 22-22 in the outer. knob shank, through the openings 7 7 and overthe faces of the arms 12-b-l2-b on the retractor. Theouterrollback also has a circular central portion 31, which is contained within the bore of the outer knob shank, andradially extending arms 32 32 which also extend through theslots 22 22 in the outer knob shank andV over the faces of the arms on the retractor. The outer rollback .28 is spaced from the intermediate rollback by acircular spacer ring 33 which is contained within the outer knob shank, and said intermediate rollback is provided at its opposite ends with angled cam surfaces 34 34 normally facing the detent pins 14 14.

A dogging rod 35 extends axially through the inner and the outer knob Shanks and through enlarged axial holes in the inner and the outer rollbacks. The intermediate rollback 27 has an axial hole therethrough which receives the dogging rod and vsaid rollback is secured to the .dogging rod by suitable `C-rings 36 and is axially movable therewith. The dogging rod is supported in said knob Shanks by the intermediate rollback and by a bushing 37 which is secured in the outer end `of the outer knob shank and through which said dogging rod extends; the outer end of said rod projecting into the outer knob 19 which contains an axial hole 38 in its outer wall. The inner knob 18 contains a conventional pushbutton 39 which projects axially therefrom and has a foot portion 4) disposed within the inner knob shank. A light compression spring 41 Vnormally urges theA pushbutton towards depressed position and against the inner end of the dogging rod.

The outer rollback, the intermediate rollback, the dogging rod to which the intermediate rollback is secured and the pushbutton are urged into normal undogging position, illustrated in Fig. 3, by a pair of compression springs 42 and 43. The small compression spring 42 surrounds the dogging rod 3S and extends through the hole in the outer rollback and is disposed between the intermediate rollback and the bushing 37, and the large spring 43 is disposed between the outer rollback and said bushing.

The door lock is retained in a slot in the edge of a door 44 by inner and outer escutcheon plates 45 and 46 in the manner fullyV described in my above mentioned co-pending application, land-it will be-understoodfrom .the above description vthat rotation; ofyeither ;the '.ir1ner ortheputer knob in either direction will cause retraction of the retractor and withdrawal of the latch bolt, and that when the outer knob is rotated, both the outer and the intermediate rollbacks turn therewith.

When it is desired to dog the outer knob against operation after the door is closed, the pushbutton 39 is depressed. Upon depression of vthe pushbutton, the dogging rod will be moved axially in the knob Shanks toward the outer side of the lock and will carry the intermediate rollback outwardly'in the slots in the outer knob shank. Said intermediate rollback will, in turn, urge the outer rollback outwardly in said. slots and toward the locking notches 9 9. The camsurfaces on the opposite ends of said intermediate rollback will engage and depress the detent pins 14 14 topermit said intermediate rollback to ride thereover, and when the inner side of the intermediate rollback passes said pins, the leaf springs 15-15 will return said pins to normal position and they will then retain the intermediate rollback, the outer rollback andthe dogging rod in dogging position, as shown in Figs. 7 and 8, wherein the radial arms on said outer rollback are disposed in the outer locking notches 9 9 which prevent rotation of said outer rollback and, consequently, of the outer knob shank by the outer knob. The pushbuttonis held in depressed position by the light spring 41 which urges the foot portion 40 against the innerend of the dogging rod. Outward movement of the intermediate andthe outer rollbacks is limited by the engagement of the outer rollback with the ends of the slots 22-22in the outer knob shank, and, as best shown in Fig. 8, the intermediate rollback is held clear of said locking notches by the spacer ring 33 and is prevented from returning to undogging position under the force of the compression springs 42 and 43 by the detent pins 14-14.

It will be understood that when the outer knob is dogged against operation, the inner knob is still free to rotate, 4and upon rotation thereof in either direction, the retractor will be retracted by the inner rollback to carry the detent pins out of engagement with the intermediate rollback whereupon the springs 42 and 43 will urge the outer rollback, the intermediate rollback, the dogging bar and the pushbutton inwardly into undogging position. If, after closing and locking the door, the person in the room should, for some reason, be unable to open the door from the inner side, the lock may be undogged by inserting a suitable implement, such as a screwdriver, through the hole 38 in the outer knob and pushing on the outer end of the dogging rod. This will shift the intermediate rollback inwardly over the detent pins and the yspring 43 will then urge the outer rollback inwardly to normal undogging position whereupon the outer knob may be turned to open the door.

If the pushbutton should be accidentally depressed whilethe door is open and the person closing the door should turn the outer knob, it will be understood from Fig. 9 that the outer rollback will be rotated and pinched between the sides of the locking slots 9 9 and the sides of the .slots 22 22 in the outer knob shank. However, as the latch bolt is depressed upon engagement with the strike and the detent pins 14 14 are carried out of engagement with the intermediate rollback upon depression of the retractor, the compression spring 42 will urge the intermediate rollback, the dogging rod, and the pushbutton into undogging position independently of the outer rollback as illustrated in Fig. 10. Upon the return of the retractor to normal position when the latch bolt enters the opening in the strike, the detent pins 14 14 will resume their normal position relatively to the intermediate rollback, and when the outer knob is released after the door is closed, the compression spring 43 will urge the outer rollback into normal undogging position. It will therefore be understood that since the detent pins act only uponjthe intermediate rollbackvwhich is always .,clarfofgthelocki-,ng slots 9 9, thepossibility. of accidental lock-outs is prevented since the outer rollback will always be free to resume its undogging position upon the release of the outer knob.

I claim:

1. In a door lock comprising a housing having a recess, a retractor for a latch bolt movable in said housing, an inner and an outer knob shank rotatable in said housing, and a separate rollback non-rotatably connected to each of said Shanks for actuating the retractor, the rollback associated with the outer knob shank being movable axially thereof and into said recess to dog the outer shank against operation; the improvement which comprises a dogging rod mounted for axial movement in said knob shanks, means projecting from said inner knob for moving said rod to dogging position, means connecting the outer rollback to said rod for movement there With into dogging position, detent means on said retractor, a projection 'on said rod engageable with said detent means for retaining the rod and the outer rollback in clogging position, said rod being movable to undogging position independently of said outer rollback when said rollback is jammed in dogging position, a spring for moving said rod to undogging position upon retraction of the retractor and disengagement of said detent means from said projection, and a separate spring for moving the outer rollback to undogging position independently of the rod.

2. In a door lock comprising a housing having a recess, a retractor for a latch bolt movable in said housing, an inner and an outer knob shank rotatable in said housing, a separate rollback non-rotatably connected to each 'of said shanks for actuating the retractor, the rollback associated with the outer knob shank being movable axially thereof and into said recess to dog the outer knob shank against operation; the improvement which comprises a dogging rod mounted for axial movement in said knob shanks and extending through an opening in each lof said rollbacks, a pushbutton projecting from said inner knob adapted, uplon depression thereof, to shift said dogging rod outwardly relatively to said lock and into dogging position, an intermediate rollback secured to said rod between said inner and outer rollbacks and slidably mounted in said outer knob shank, whereby upon movement of the dogging rod into dogging position said intermediate nollback engages and shifts said outer rollback outwardly into said recess, detent means on said retractor engageable by said intermediate rollback for retaining the outer rollback in dogging position, said dogging rod and said intermediate rollback being movable inwardly to undogging position independently of said outer rollback when said outer rollback is jammed in dog-ging position, a trst spring for moving said dogging rod and said in termediate rollback inwardly to undogging position independently of the outer rollback, and a separate spring for moving the outer rollback inwardly to und'ogging position independently of said dogging rod and said intermediate rollback.

3. The subject matter set forth in claim 2 wherein the rst spring is contained within said outer knob shank and extends through an opening in the outer rollback and into engagement with said intermediate rollback, and said separate spring surrounds said first spring and engages said outer rollback.

References Cited in the tile of this patent UNITED STATES PATENTS 2,666,320 Teich Jan. 19, 1954 2,694,916 McConnell Nov. 23, 1954 2,702,466 McConnell Feb. 22, 1955 

